CN111495189A - Lime kiln desulfurization, denitration, dust removal and cooling method - Google Patents

Lime kiln desulfurization, denitration, dust removal and cooling method Download PDF

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Publication number
CN111495189A
CN111495189A CN202010302517.1A CN202010302517A CN111495189A CN 111495189 A CN111495189 A CN 111495189A CN 202010302517 A CN202010302517 A CN 202010302517A CN 111495189 A CN111495189 A CN 111495189A
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CN
China
Prior art keywords
denitration
cooling
dust
catalyst
dust removal
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Pending
Application number
CN202010302517.1A
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Chinese (zh)
Inventor
宋瑞
宋文彬
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Anhui Chenrui Energy Conservation And Environmental Protection Science And Engineering Co ltd
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Anhui Chenrui Energy Conservation And Environmental Protection Science And Engineering Co ltd
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Priority to CN202010302517.1A priority Critical patent/CN111495189A/en
Publication of CN111495189A publication Critical patent/CN111495189A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86Catalytic processes
    • B01D53/90Injecting reactants
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D46/00Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/02Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77Liquid phase processes
    • B01D53/78Liquid phase processes with gas-liquid contact
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86Catalytic processes
    • B01D53/8603Removing sulfur compounds
    • B01D53/8609Sulfur oxides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86Catalytic processes
    • B01D53/8621Removing nitrogen compounds
    • B01D53/8625Nitrogen oxides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2251/00Reactants
    • B01D2251/30Alkali metal compounds
    • B01D2251/304Alkali metal compounds of sodium
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2251/00Reactants
    • B01D2251/40Alkaline earth metal or magnesium compounds
    • B01D2251/404Alkaline earth metal or magnesium compounds of calcium
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2251/00Reactants
    • B01D2251/60Inorganic bases or salts
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2251/00Reactants
    • B01D2251/60Inorganic bases or salts
    • B01D2251/604Hydroxides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2251/00Reactants
    • B01D2251/60Inorganic bases or salts
    • B01D2251/606Carbonates

Abstract

A method for desulfurizing, removing pin, dedusting and cooling a lime kiln. Collecting the tail gas after combustion to enable sulfur dioxide, sulfur trioxide, sodium hydroxide and calcium hydroxide to generate neutralization reaction in a tower; the denitration catalyst is subjected to denitration by an SCR selective reduction method, and the components of composite vanadium, manganese, copper, nickel, lanthanum, cerium, scandium and yttrium are adopted to meet the requirements, so that the activity problem of the denitration catalyst under the medium-low temperature working condition and the poisoning problem of the active components of the catalyst are solved; adopting glass fiber to prick felt filter cloth, and coating PTFE on the surface of a filter bag after surface chemical and Teflon treatment; the negative pressure cooling of the fan is adopted, and the contact area is greatly increased by adopting a multi-channel technology. The desulfurized sodium hydroxide can be repeatedly used, the oxidation rate of SO ₂/SO ₃ is controlled by the compound effect of various noble metals and rare earth elements, the alkali-earth-containing dust concentration in the adaptive working condition can be gradually adapted to the cultivation from 50mg/m to 5g/m, and the alkali-earth-containing dust concentration in the dust is gradually adapted to 50% from 5%.

Description

Lime kiln desulfurization, denitration, dust removal and cooling method
Technical Field
The invention relates to the technical field of lime kilns, in particular to a method for desulfurizing, removing pins, removing dust and cooling a lime kiln.
Background
The fuel is divided into a mixed burning kiln, namely a gas burning kiln for burning solid fuel, coke powder, coal and the like. The gas burning kiln comprises blast furnace gas, coke oven gas, calcium carbide tail gas, generator gas, natural gas and the like. The kiln type includes a shaft kiln, a rotary kiln, a sleeve kiln, a cidvemaster kiln, a maez kiln (switzerland), a flecs kiln (italy), and the like. Meanwhile, the method is divided into a positive pressure operation kiln and a negative pressure operation kiln. The Linzhou modern science and technology center develops and designs a mixed burning kiln with the volume less than 300 cubic meters and a gas burning kiln with the volume less than 140 cubic meters, in particular to an XD type energy-saving environment-friendly lime kiln for burning blast furnace gas and coke oven gas, overcomes the difficult problem of burning of high heat value and short flame of the coke oven gas, and can fully utilize the residual coke oven gas. The original coke oven gas 'lighting a sky lamp' causes environmental pollution to become valuable energy for creating benefits for enterprises. The method is a very good effective way for saving energy, protecting environment and increasing efficiency for small and medium-sized iron and steel enterprises, coking enterprises, calcium carbide enterprises and refractory material industries.
The dust discharged during the calcination of lime contains a large amount of harmful gases and dust with the particle size of less than 10 microns, and the dust contains SO2; F2O3; AIO3And the like. The harmful gas and dust have great harm to human bodies, children are more serious if respiratory diseases such as bronchus and lung are caused by long-term inhalation of people, moreover, the dust floating in the air also contains carcinogens, and the harmful dust with the average breathing concentration exceeding 150mg/m causes fatal harm to human bodies if people breathe for 24 hours.
Disclosure of Invention
Aiming at the problems in the related art, the invention provides a method for desulfurizing, removing pins, removing dust and cooling a lime kiln, which solves the problems in the background art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a method for desulfurizing, removing pin, dedusting and cooling a lime kiln, which adopts the following scheme:
and (3) desulfurization:
collecting the tail gas after combustion to enable sulfur dioxide, sulfur trioxide, sodium hydroxide and calcium hydroxide to generate neutralization reaction in a tower;
denitration:
the denitration catalyst is subjected to denitration by an SCR selective reduction method, and the components of composite vanadium, manganese, copper, nickel, lanthanum, cerium, scandium and yttrium are adopted to meet the requirements, so that the activity problem of the denitration catalyst under the medium-low temperature working condition and the poisoning problem of the active components of the catalyst are solved;
dust removal:
adopting glass fiber to prick felt filter cloth, and coating PTFE on the surface of a filter bag after surface chemical and Teflon treatment;
cooling:
the fan is used for negative pressure cooling, the contact area and the cooling speed are greatly increased by adopting a multi-channel technology, and the cooling channel is made of a high-heat-conduction corrosion-resistant material.
Furthermore, the cooling channel adopts an interlayer design.
Further, the cooling channel is coated with a heat absorbing material at a position close to the inner wall.
The invention has the beneficial effects that:
the sodium hydroxide desulfurized by the invention can be repeatedly used, and SO is controlled by the compound effect of various noble metals and rare earth elements2/SO3The oxidation rate of ammonium bisulfate is increased, the decomposition rate of the generated ammonium bisulfate is accelerated, and the cumulative generation amount of ammonium bisulfate is reduced. And the alkali earth metal-containing dust concentration in the adaptive working condition can be gradually adapted to 5g/m high speed fruit from 50mg/m, and the alkali earth metal concentration in the dust is gradually adapted to 50% from 5%.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
According to the embodiment of the invention, a lime kiln desulfurization, denitration, dust removal and cooling method is provided.
And (3) desulfurization:
adopt sodium hydroxide, calcium hydroxide, because sulfur-containing coal produces sulfur dioxide, sulfur trioxide with oxygen reaction in the air when burning, through collecting the tail gas after the burning, let sulfur dioxide, sulfur trioxide and sodium hydroxide, calcium hydroxide produce neutralization reaction in the tower, no longer contain sulfur dioxide, sulfur trioxide in making the waste gas to realize the desulfurization.
And (3) desulfurization and absorption processes:
and (3) a regeneration process:
under the effect of sulphur gas reboil negative pressure, get into the desulfurizing tower through the pipeline, in the flue gas sulfur dioxide in the desulfurizing tower with alkali lye reverse contact and fully send the emergence and answer, accomplish alkali neutralization reaction, gaseous after the reaction is through the dehydration back, the fan is taken away, alkali lye concentration descends after the reaction, sodium sulfite reacts with calcium hydroxide and regenerates sodium hydroxide and calcium carbonate and deposits, sodium hydroxide after the regeneration can use repeatedly.
Denitration:
the denitration flue gas temperature in the lime kiln industry is generally 180-240 ℃, the optimal reaction temperature of the conventional SCR catalyst is generally 320-400 ℃, and the dust in the lime kiln flue gas contains a large amount of K, Na, Ca, Mg and the like and contains SO2And SO3When existing, sticky sulfate is generated and coated on the surface of the catalyst to influence the activity of the catalyst.
The components of vanadium, manganese, copper, nickel, lanthanum, cerium, scandium and yttrium are compounded, so that the activity problem of the denitration catalyst under the medium-low temperature working condition, the poisoning problem of the active components of the catalyst and the like are solved, the working temperature range of the denitration catalyst is 260-450 ℃, the operation is stable, and the emission reaches the standard.
SO is controlled by the compound effect of various noble metals and rare earth elements2/SO3The oxidation rate of ammonium bisulfate is increased, the decomposition rate of the generated ammonium bisulfate is accelerated, and the cumulative generation amount of ammonium bisulfate is reduced. And the alkali earth metal-containing dust concentration in the adaptive working condition can be gradually adapted to 5g/m high speed fruit from 50mg/m, and the alkali earth metal concentration in the dust is gradually adapted to 50% from 5%.
Dust removal:
the glass fiber needled felt has the advantages that the glass fiber monofilaments are randomly and alternately inserted, the glass fibers are short, and the precursor fibers are carded into the felt and then fixed on the glass fiber base cloth in a needling mode, so that the glass fibers of the felt layer and the reinforced glass fiber base cloth achieve the entanglement effect by a mechanical method, the felt is of an unoriented three-dimensional microporous structure, small in gap and large in porosity, and has good sound absorption, shock absorption, corrosion resistance, insulation, high temperature resistance and flame retardance.
The surface of the filter bag is chemically treated by Teflon and then coated with PTFE, in addition, some special fibers are subjected to surface treatment by a special chemical method so as to achieve the strongest bonding effect, and the low emission of the filter bag is realized by less than 5mg after the filter bag is coated with the film.
Cooling:
adopt fan negative pressure cooling to adopt multichannel technique greatly increased's area of contact, and cooling speed, the cooling passageway adopts high heat conduction corrosion resistant material, and the cooling passageway adopts the intermediate layer design, and the department is scribbled to have the heat absorbing material near the inner wall.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (3)

1. A method for lime kiln desulfurization, denitration, dust removal and temperature reduction is characterized by comprising the following steps:
and (3) desulfurization:
collecting the tail gas after combustion to enable sulfur dioxide, sulfur trioxide, sodium hydroxide and calcium hydroxide to generate neutralization reaction in a tower;
denitration:
the denitration catalyst is subjected to denitration by an SCR selective reduction method, and the components of composite vanadium, manganese, copper, nickel, lanthanum, cerium, scandium and yttrium are adopted to meet the requirements, so that the activity problem of the denitration catalyst under the medium-low temperature working condition and the poisoning problem of the active components of the catalyst are solved;
dust removal:
adopting glass fiber to prick felt filter cloth, and coating PTFE on the surface of a filter bag after surface chemical and Teflon treatment;
cooling:
the fan is used for negative pressure cooling, the contact area is greatly increased by adopting a multi-channel technology, and the cooling channel is made of a high-heat-conduction corrosion-resistant material.
2. The method of claim 1, wherein the cooling channel is of a sandwich design.
3. The method of claim 1, wherein the temperature-reducing channel is coated with a heat-absorbing material proximate the inner wall.
CN202010302517.1A 2020-04-17 2020-04-17 Lime kiln desulfurization, denitration, dust removal and cooling method Pending CN111495189A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010302517.1A CN111495189A (en) 2020-04-17 2020-04-17 Lime kiln desulfurization, denitration, dust removal and cooling method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010302517.1A CN111495189A (en) 2020-04-17 2020-04-17 Lime kiln desulfurization, denitration, dust removal and cooling method

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CN111495189A true CN111495189A (en) 2020-08-07

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113144888A (en) * 2021-03-08 2021-07-23 山东福源节能环保工程有限公司 Desulfurization and denitrification ultralow emission method for boiler

Citations (2)

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Publication number Priority date Publication date Assignee Title
CN104162352A (en) * 2014-04-25 2014-11-26 南京中电环保科技有限公司 Glass kiln flue gas de-dusting, denitrification and desulfurization integral treatment process
CN110496527A (en) * 2018-05-16 2019-11-26 上海梅山钢铁股份有限公司 A kind of method of coke oven flue exhuast gas desulfurization denitration

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104162352A (en) * 2014-04-25 2014-11-26 南京中电环保科技有限公司 Glass kiln flue gas de-dusting, denitrification and desulfurization integral treatment process
CN110496527A (en) * 2018-05-16 2019-11-26 上海梅山钢铁股份有限公司 A kind of method of coke oven flue exhuast gas desulfurization denitration

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中国材料研究学会组织编写: "《中国战略性新兴产业-新材料 稀土催化材料》", 30 June 2017, 中国铁道出版社 *
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113144888A (en) * 2021-03-08 2021-07-23 山东福源节能环保工程有限公司 Desulfurization and denitrification ultralow emission method for boiler

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